PDF Import Large Documents

- import a pdf to photoshop which has large size (e.g. 746 x 216 mm, 62 mb, with a lot of graphics) - change the resolution in 1200 dpi in the import-options- error message pops up: Number between 0,01 and 67,73 is necessary..- photoshop changes width 74,6 cm to 67,73 cm; height still stays at 21,6 cm...So the picture is scaled unproportional...The main problem: If I import the pdf to photoshop and 1200 dpi is already in preset from a previous import Photoshop don't show a message about the (unproportional) scaling of the document.That's really dangerous... :/